diff --git a/idea/src/org/jetbrains/jet/plugin/compiler/JetCompilerManager.java b/idea/src/org/jetbrains/jet/plugin/compiler/JetCompilerManager.java
index 3f1f54f5e2f..7175f450295 100644
--- a/idea/src/org/jetbrains/jet/plugin/compiler/JetCompilerManager.java
+++ b/idea/src/org/jetbrains/jet/plugin/compiler/JetCompilerManager.java
@@ -32,6 +32,7 @@ import com.intellij.util.containers.ContainerUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.plugin.JetFileType;
 import org.jetbrains.jet.plugin.compiler.configuration.KotlinCompilerWorkspaceSettings;
+import org.jetbrains.k2js.JavaScript;
 
 import java.io.PrintStream;
 import java.io.PrintWriter;
@@ -45,7 +46,7 @@ public class JetCompilerManager implements ProjectComponent {
 
     // Comes from external make
     private static final String PREFIX_WITH_COMPILER_NAME = KOTLIN_COMPILER_NAME + ": " + INTERNAL_ERROR_PREFIX;
-    private static final Set<String> FILE_EXTS_WHICH_NEEDS_REFRESH = ContainerUtil.immutableSet(".js", ".map");
+    private static final Set<String> FILE_EXTS_WHICH_NEEDS_REFRESH = ContainerUtil.immutableSet(JavaScript.DOT_EXTENSION, ".map");
 
     private final Project project;
 
diff --git a/idea/src/org/jetbrains/jet/plugin/configuration/KotlinJsModuleConfigurator.java b/idea/src/org/jetbrains/jet/plugin/configuration/KotlinJsModuleConfigurator.java
index 520bd8055a3..a288b6a5366 100644
--- a/idea/src/org/jetbrains/jet/plugin/configuration/KotlinJsModuleConfigurator.java
+++ b/idea/src/org/jetbrains/jet/plugin/configuration/KotlinJsModuleConfigurator.java
@@ -28,13 +28,14 @@ import org.jetbrains.jet.plugin.framework.ui.CreateJavaScriptLibraryDialogWithMo
 import org.jetbrains.jet.plugin.framework.ui.FileUIUtils;
 import org.jetbrains.jet.plugin.project.ProjectStructureUtil;
 import org.jetbrains.jet.utils.PathUtil;
+import org.jetbrains.k2js.JavaScript;
 
 import java.io.File;
 import java.util.Arrays;
 import java.util.List;
 
 public class KotlinJsModuleConfigurator extends KotlinWithLibraryConfigurator {
-    public static final String NAME = "js";
+    public static final String NAME = JavaScript.LOWER_NAME;
 
     @NotNull
     @Override
@@ -45,7 +46,7 @@ public class KotlinJsModuleConfigurator extends KotlinWithLibraryConfigurator {
     @NotNull
     @Override
     public String getPresentableText() {
-        return "JavaScript";
+        return JavaScript.FULL_NAME;
     }
 
     @Override
diff --git a/idea/src/org/jetbrains/jet/plugin/k2jsrun/K2JSRunnerUtils.java b/idea/src/org/jetbrains/jet/plugin/k2jsrun/K2JSRunnerUtils.java
index 6e29f3f6430..4fafdf16129 100644
--- a/idea/src/org/jetbrains/jet/plugin/k2jsrun/K2JSRunnerUtils.java
+++ b/idea/src/org/jetbrains/jet/plugin/k2jsrun/K2JSRunnerUtils.java
@@ -31,6 +31,7 @@ import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.vfs.VirtualFileManager;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.k2js.JavaScript;
 
 import java.io.File;
 import java.io.IOException;
@@ -42,7 +43,7 @@ public final class K2JSRunnerUtils {
 
     @NotNull
     public static String constructPathToGeneratedFile(@NotNull Project project, @NotNull String outputDirPath) {
-        return outputDirPath + "/" + project.getName() + ".js";
+        return outputDirPath + "/" + project.getName() + JavaScript.DOT_EXTENSION;
     }
 
     public static void copyJSFileFromOutputToDestination(@NotNull Project project,
diff --git a/js/js.frontend/src/org/jetbrains/k2js/JavaScript.kt b/js/js.frontend/src/org/jetbrains/k2js/JavaScript.kt
new file mode 100644
index 00000000000..02c93294813
--- /dev/null
+++ b/js/js.frontend/src/org/jetbrains/k2js/JavaScript.kt
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.k2js
+
+object JavaScript {
+    val FULL_NAME = "JavaScript"
+    val NAME = "JS"
+    val LOWER_NAME = "js"
+
+    val EXTENSION = "js"
+    val DOT_EXTENSION = "." + EXTENSION
+}
\ No newline at end of file
diff --git a/js/js.frontend/src/org/jetbrains/k2js/config/LibrarySourcesConfig.java b/js/js.frontend/src/org/jetbrains/k2js/config/LibrarySourcesConfig.java
index ca2ddd4d2db..fcda5a14345 100644
--- a/js/js.frontend/src/org/jetbrains/k2js/config/LibrarySourcesConfig.java
+++ b/js/js.frontend/src/org/jetbrains/k2js/config/LibrarySourcesConfig.java
@@ -27,6 +27,7 @@ import com.intellij.util.io.URLUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.plugin.JetFileType;
+import org.jetbrains.k2js.JavaScript;
 
 import java.io.File;
 import java.util.ArrayList;
@@ -45,8 +46,8 @@ public class LibrarySourcesConfig extends Config {
     private static final Logger LOG = Logger.getInstance("#org.jetbrains.k2js.config.LibrarySourcesConfig");
     public static final String STDLIB_JS_MODULE_NAME = "stdlib";
     public static final String BUILTINS_JS_MODULE_NAME = "builtins";
-    public static final String BUILTINS_JS_FILE_NAME = BUILTINS_JS_MODULE_NAME + ".js";
-    public static final String STDLIB_JS_FILE_NAME = STDLIB_JS_MODULE_NAME + ".js";
+    public static final String BUILTINS_JS_FILE_NAME = BUILTINS_JS_MODULE_NAME + JavaScript.DOT_EXTENSION;
+    public static final String STDLIB_JS_FILE_NAME = STDLIB_JS_MODULE_NAME + JavaScript.DOT_EXTENSION;
 
     @NotNull
     private final List<String> files;
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java
index e55faa142dd..eec2c6896f3 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java
@@ -18,6 +18,7 @@ package org.jetbrains.k2js.test.semantics;
 
 import com.google.common.collect.Lists;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.k2js.JavaScript;
 import org.jetbrains.k2js.config.EcmaVersion;
 import org.jetbrains.k2js.test.SingleFileTranslationTest;
 
@@ -38,7 +39,7 @@ public final class NativeInteropTest extends SingleFileTranslationTest {
     protected List<String> additionalJsFiles(@NotNull EcmaVersion ecmaVersion) {
         List<String> result = Lists.newArrayList(super.additionalJsFiles(ecmaVersion));
 
-        String jsFilePath = pathToTestDir() + NATIVE + "/" + getTestName(true) + ".js";
+        String jsFilePath = pathToTestDir() + NATIVE + "/" + getTestName(true) + JavaScript.DOT_EXTENSION;
         File jsFile = new File(jsFilePath);
         if (jsFile.exists() && jsFile.isFile()) {
             result.add(jsFilePath);
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/utils/JsTestUtils.java b/js/js.tests/test/org/jetbrains/k2js/test/utils/JsTestUtils.java
index 3a222bd505a..7bd1dcb659d 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/utils/JsTestUtils.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/utils/JsTestUtils.java
@@ -16,12 +16,11 @@
 
 package org.jetbrains.k2js.test.utils;
 
-import com.google.dart.compiler.backend.js.ast.JsFunction;
-import com.google.dart.compiler.backend.js.ast.JsNode;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.util.Function;
 import com.intellij.util.containers.ContainerUtil;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.k2js.JavaScript;
 import org.jetbrains.k2js.config.EcmaVersion;
 
 import java.io.File;
@@ -43,7 +42,7 @@ public final class JsTestUtils {
 
     @NotNull
     public static String convertFileNameToDotJsFile(@NotNull String filename, @NotNull EcmaVersion ecmaVersion) {
-        String postFix = "_" + ecmaVersion.toString() + ".js";
+        String postFix = "_" + ecmaVersion.toString() + JavaScript.DOT_EXTENSION;
         int index = filename.lastIndexOf('.');
         if (index < 0) {
             return filename + postFix;